7(20-x)=87.5
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(x+20)/7+x/4.8=45(x+20)/7+5x/24=4524(x+20)+7*5x=45*7*2439x+24*5*4=5*9*7*2439x+120*4=120*6339x=120*63
4(x+3)=2x+24x+12=2x+24x-2x=2-122x=-10x=-57(x-1)=2x+37x-7=2x+37x-2x=3+75x=10x=24x+20=6x-304x-6x=-30-2
1、56-8X=11+X8X+X=56-119X=45X=52、3X-2=X+1+6X3X-2=7X+17X-3X=-2-14X=-3X=-3/43、7+X=2X+20-14X7+X=20-12XX+
x(1+2+...+9)=x(9-8-7-...-1)x=0记得采纳啊
梨树x+3x=2404x=240x=60桃树为60*3=180棵解设还需要租辆x小客车32*3+5*x=1205*x=24x=4.8就是要5辆小汽车解设小聪今年x岁9*x-7.5*x=61.5*x=6
原式=4x-60x+3x^2=5x-140x+7x^24x^2-79x=0x=0或者x=7/4
2x-36=20-6x2x+6x=20+368x=56x=56÷8x=756-7x=20-5x7x-5x=56-202x=36x=36÷2x=18再问:验算不对啊再答:肯定对再问:你确定?再答:当然了
化简得2/x^2+6x=0,即(1+3x^3)/x^2=0,所以x=-(1/3)^(1/3)
x-60+3x=3x-63+7x4x-60=10x-634x-60+63=10x4x+3=10x3=10x-4x3=6xx=1/2
x+3(x-20)=3x-7(9-x)x+3x-60=3x-63+7x4x-60=10x-636x=3x=0.5再问:2(-2-m)=8x(-2)-4m已知x=-2再答:-4-2m=-16-4m2m=
4x-3(x-20)=6x-7(9-x)4x-3x+60=6x-63+7xx-7x-6x=-63-60-12x=-123x=10.25
1/4X=13X=5210/3X=20/21X=2/70.72X=12.96X=18
5x-3(20-x)=3x-7(9-x)5x-60+3x=3x-63+7x8x-60=10x-6310x-8x=63-602x=3x=3÷2x=1.5
4X+3(X-20)=6X+7(X-9)4X+3X-60=6X+7X-637X-60=13X-6313X-7X=63-606X=3X=3/6X=0.5
(x-22)+(x-24)+(x-27)+(x-20)=xx-22+x-24+x-27+x-20=x4x-93=x4x-x=933x=93x=31
3(x-7)+5(x-4)=15?3x-21+5x-20=158x=15+41x=56/8=74x-3(20-x)=-44x-60+3x=-47x=-4+60x=56/7=8
4x-60x+3x*x=5x-140x+7x*x4x*x-79x=0x(4x-79)=0x=0或x=79/4
#includesintjiesheng(intn)//用于计算阶乘如:3!{if(n=1)rerunn;returnn*hh(n-1)}doubledigui(intn,intx)//用以计算y=x
60%x+91=1030.6x=103-910.6x=12x=20x-20%x=4.8x-0.2x=4.80.8x=4.8x=613%x-19=70.13x=19+70.13x=26x=200